Method of making a high tear strength glass mat

Abstract

A urea-formaldehyde resin modified with a water-insoluble anionic phosphate ester is used as binder in the preparation of glass fiber mats using a hydroxyethyl cellulose white water system. High tear strength glass fiber mats can be produced in a hydroxyethyl cellulose white water system using such a binder.

I claim: 
     
       1. A method of making a glass fiber mat comprising: dispersing glass fibers in an aqueous medium containing hydroxyethyl cellulose to form a slurry,   passing the slurry through a mat forming screen to form a wet glass fiber mat,   applying a binder comprising a urea-formaldehyde resin and a water-insoluble, unneutralized anionic phosphate ester, a C 8  to C 16  fatty alcohol to said wet glass fiber mat, and   curing the binder.   
     
     
       2. The method of claim 1 wherein the anionic phosphate ester is present in an amount of from about 0.1% to about 5.0% based on the weight of the binder.